<template>
  <div>
    <q-card>
      <q-card-section class="text-h6">
        Scatter Chart
      </q-card-section>
      <q-card-section>
        <div ref="scatterchart" id="scatterChart" style="height: 300px;"></div>
      </q-card-section>
      <q-resize-observer @resize="onResize"/>
    </q-card>
  </div>
</template>

<script>
import * as echarts from "echarts"; //这个跟以前是不一样的。
var data = [
  [[28604, 77, 17096869, 'Australia', 1990], [31163, 77.4, 27662440, 'Canada', 1990], [1516, 68, 1154605773, 'China', 1990], [13670, 74.7, 10582082, 'Cuba', 1990], [28599, 75, 4986705, 'Finland', 1990], [29476, 77.1, 56943299, 'France', 1990], [31476, 75.4, 78958237, 'Germany', 1990], [28666, 78.1, 254830, 'Iceland', 1990], [1777, 57.7, 870601776, 'India', 1990], [29550, 79.1, 122249285, 'Japan', 1990], [2076, 67.9, 20194354, 'North Korea', 1990], [12087, 72, 42972254, 'South Korea', 1990], [24021, 75.4, 3397534, 'New Zealand', 1990], [43296, 76.8, 4240375, 'Norway', 1990], [10088, 70.8, 38195258, 'Poland', 1990], [19349, 69.6, 147568552, 'Russia', 1990], [10670, 67.3, 53994605, 'Turkey', 1990], [26424, 75.7, 57110117, 'United Kingdom', 1990], [37062, 75.4, 252847810, 'United States', 1990]],
  [[44056, 81.8, 23968973, 'Australia', 2015], [43294, 81.7, 35939927, 'Canada', 2015], [13334, 76.9, 1376048943, 'China', 2015], [21291, 78.5, 11389562, 'Cuba', 2015], [38923, 80.8, 5503457, 'Finland', 2015], [37599, 81.9, 64395345, 'France', 2015], [44053, 81.1, 80688545, 'Germany', 2015], [42182, 82.8, 329425, 'Iceland', 2015], [5903, 66.8, 1311050527, 'India', 2015], [36162, 83.5, 126573481, 'Japan', 2015], [1390, 71.4, 25155317, 'North Korea', 2015], [34644, 80.7, 50293439, 'South Korea', 2015], [34186, 80.6, 4528526, 'New Zealand', 2015], [64304, 81.6, 5210967, 'Norway', 2015], [24787, 77.3, 38611794, 'Poland', 2015], [23038, 73.13, 143456918, 'Russia', 2015], [19360, 76.5, 78665830, 'Turkey', 2015], [38225, 81.4, 64715810, 'United Kingdom', 2015], [53354, 79.1, 321773631, 'United States', 2015]]
];
export default {
  name: "ScatterPlot",
  data() {
    return {
      model: false,
      options: {
        xAxis: {},
        yAxis: {
          scale: true
        },
        grid: {
          bottom: '15%',
        },
        series: [{
          name: '1990',
          data: data[0],
          type: 'scatter',
          symbolSize: function (data) {
            return Math.sqrt(data[2]) / 5e2;
          },
          emphasis: {
            focus: 'self'
          },
          labelLayout: {
            y: 20,
            align: 'center',
            hideOverlap: true,
            moveOverlap: 'shiftX'
          },
          labelLine: {
            show: true,
            length2: 5,
            lineStyle: {
              color: '#bbb'
            }
          },
          label: {
            show: true,
            formatter: function (param) {
              return param.data[3];
            },
            minMargin: 10,
            position: 'top'
          }
        }]
      },
      scatter_chart: null
    }
  },
  mounted() {
    this.init();
  },
  watch: {
    '$q.dark.isActive': function () {
      this.init();
    }
  },
  methods: {
    init() {
      let scatterChart = document.getElementById('scatterChart');
      echarts.dispose(scatterChart);
      let theme = this.model ? 'dark' : 'light';
      this.scatter_chart = echarts.init(scatterChart, theme);
      this.scatter_chart.setOption(this.options)
    },
    onResize() {
      if (this.scatter_chart) {
        this.scatter_chart.resize();
      }
    }
  }
}
</script>

<style scoped>
</style>
